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I. ZWICKY.

PUMP.

APPLICATION FILED OCT. 4 1913.

1,232, 1 59. Patented July 3, 1917.

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APPLICATION FILED ocT. 4. I9I3.

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APPLICATION FILED OCT. 4.1913.

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APPLICATION FILED OCT. 4| |913- 1,23%1 59 Patented July, 19W.

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APPLICATION FILED OCT- 4. |913.

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PUMP.

Application filed October 4, 1913.

To all whom t may concern.'

Be it known that I, JEAN Zwicnv, a citizen of the Republic of Switzerland, residing at 66 Chester road, South Tottenham, in the county of Middlesex, England, have invented new and useful Improvements in Pumps, of which the following is a speciiication.

This invention relates to improved constructions of pump especially applicable to suction pumps for water, but useful also with gases.

The purpose of the invention is to provide a convenient and reliable portable form of pump which can be readily erected and operated by hand. Reliability is largely dependent upon securing the `maximum possible opening of port with the minimum relative movement between piston and piston rod; so that both the wear through `shock and the friction of the passage of `fluid are reduced as low as possible.

Constructions according to the invention are illustrated in the accompanying drawings, in which Figure 1 is an elevation of a complete pump.

Fig. 2 is an enlarged longitudinal section 'of the central portion of such pumpshowing how the movement of fluid is controlled.

Fig. 3 is a cross section on the line III-III of Fig. 2.

Fig. 4 is a detail of the operating lever.

Fig. 5 is a longitudinal section of a pump showing a modified construction of pump ports.

Fig. 6 is a cross section on the line IV-IV of Fig. 5. i

Fig. 7 is an enlarged cross section of the end of the pump cylinder in this construction, showing how the end plate is fastened on.

Fig. 8 is a detail of the fastening device.

Fig. 9 is a longitudinal section of a third form of construction, and

Fig. 10 a cross section of it on the line i X--X of Fig. 9.

Fig.` 11 is a longitudinal section ofthe valver structure of another mcdication of pump, of which j Fig. 12 is a transverse section on the line XII-XII'of Fig. 11. y

Fig. 13 is an external view of a pump embodying the valve structure of Figs. 11 and 12 showing an alternative arrangement of operating lever,

Specification of Letters Patent.

Patented July 3, 1917.

Serial No. 793,399.

In the constructions illustrated in Figs. l-ji the tubular piston rod 1 is stationary being pivoted at 2 upon a suitable stand 3. Its lower end is turned to the side as seen at 4 to receive an inlet hose. Similarly its top is turned to the side for junction to a supply pipe, while the vertical column of the rod terminates in a. suitable handle 5 by which the pump may be supported in use. Ihe cylinder 6 slides on the piston rod, bemg moved by means of the lever shown in operative position in dotted lines. In order that the pump may be compactly folded to secure portability this handle is constructed intwovparts. A rod 7, preferably hollow, is pivoted at 8 at the lower end of the piston rod and at its upper end is reduced in section, being flat on two sides but otherwise conical and terminating in a head 9. Upon this rod slides a tube 10 which is formed in two separate parts joined by a yoke 11. At its lower end the tube 10 is forked and carries spring-pressed pins 12. Its upper' end is formed as a suitable handle 13 and its yoke has bosses 15 to receive pins which pass through them and into recesses provided on the end of the cylinder 6.

When the pump is required for use the tube 10 is pulled ed from the rod 7 as far as it will go, the pins 12 engaging against the head 9 to prevent complete withdrawal and engaging against the flattened surfaces beside the head to form a pivot for the part 10. The yoke 11 is passed over the end 5 of the pump into the position shown in dotted lines and is then connected with the cylinder. When the pump is no longer required, the lever 10 is detached from the cylinder, passed over the head of the pump again rotated on its axis so that the pins 12 come uponV the conical reduced portion of the rod 7 and the tube can then be pushed back over l the rod to the position shown in full lines.

The piston rod 1 is formed in two portions which are joined in the interior of the cylinder 6 by a tubular valve section 16 which screws on to castings 17, 18 which in turn screw into the parts of the pitson rod. This tubular valve section has three rings or ports 19, 20 and 21. Its interior is divided by a slanting curved partition 22 which is so formed that both the lower 'port 19 and the Vupper port 21 open on the right hand side of the partition, while the intermediate port 2O opens on the left hand side of it. rIhe outer .surface of the tube section 16 is recessed circumferentially at the ports in order to increase the port area as much as possible.

Upon the tube 16 there slides a valve sleeve 23 the motion of which is limited by the castings 17, 18 or preferably by rubber or like rings 24 mounted in those castings. This sleeve has secured to it by a screwed ring 25 or by a split ring sprung into place, the cups of rubber or other material 26 which complete the piston and make tightl joint with the cylinder 6. There are two rings of ports 27, 28, in the sleeve 23 each of which may register with either an end ring or the middle ring of ports in the tube secL tion 16 according as the sleeve 23 is in one or other of its extreme positions.

In a boss 29'as in the drawing, by a spider 30, there slides the stem 31l of a valve 32 which has its seating in the casting 18.. If the pump is intended for water the part 32 of the valve is conveniently formed of dermatin. There may be a spring around the stem 31 pressing the valve on to its seating.

The working of the pump will be readily understood. In the position shown in Fig. 2 the cylinder 6 is moving downward. Fluid is entering through the lower end 4 of the piston rod, passing the valve 32 and filling the enlarging space below the piston through the ports 19 and 27. The fluid in the space above the piston is passing out through the ports 28, 20 and the top of the piston rod. When the direction of motion ofthe cylinder 6 reverses, the piston 26 moves with the cylinder until the sleeve 23 abuts upon the casting 17 when the connections of the tw-o compartments of the cylinder to the two portions of the piston rod `are reversed.

A short interval is occupied in this relative movement of the piston and piston rod. Consequently the ports 19, 2.7 are not closed the instant the motion of the cylinder and therefore the suction ceases. This, however, is not a source of loss because the valve 32 drops upon its seating immediately suction ceases and so prevents the return of any fiuid that hasr been drawn .in-.-

The construction of Figs. 5 to 8 presents a modified form both of the controlling valves and of the cylinder. The ports in the tube section 33 are generally similar in arrange- V ready access to everythingv which need repair 'or renewal. The sleeve of the valve Y'32 slides in a boss 438 formed ion ifh 33 as above suggested, the interior of this boss being open to fluid.v As before there is an outer sleeve 40 with ports similarly arranged to which the piston 41 is fastened in this case by a ring 42 which is screwed upon the sleeve 40.

In order that the end of the cylinder may also be readily taken off without much unscrewing, the fastening device shown in Fig. 7 may be employed instead of the screwedon end shown in Fig. 5. Upon the end of the cylinder proper there is secured by a screw thread or in other suitable manner a flanged ring 43. The dished cylinder cover 44 abuts against this ring. To press and hold the two together there is provided a divided slotted ring 45 the two parts of which are hinged together .at 46 and have bosses 47 by means of which the free ends can be drawn together and locked inv any suitable manner. The under surface of the slot in the ring 45 is flat while the upper surface, like the surface of the cover 44, is slightly Vsloped so that the slot is wedge shaped. Thus as the two halves of thefring are drawn together they press the coverof the cylinder down upon the ring 43. This method of fastening the end cover upon a cylinder is clearly of general application.

A third form of construction -of the piston and controlling ports is shown in Figs. 9 and 10. In this structure there is screwed upon a ring 48 fastened to one portion of the piston rod a casting which consists of two cylindrical parts 49 and 50. The'outer of these has in this case four sets of ports 51, 52, 53, 54. The inner cylindrical 'portion. 5G is closed at one .end and its interior is in communication with the left hand portion of the pistonrod. Radial partitions join the cylindrical parts 49 and :50 and the annular space between these two parts is closed at the ends between alternate pairs of radial partitions. This structure thus forms a series of alternate channels, in this case four, of which the one set conduct fluid from the ports 51 parallel to the axis of the pump to the right hand portion of the piston rod while the others permit the .entry of fluid radially from the ports 52, ,53 t0 the interior of the cylinder 50 and the left hand portion of the piston rod The ports 54 .open vdirectly on the right hand side of the end of the cylinder ,50 and so into the right hand portion of the piston nod. As before there is an outer sleeve 56 which has two sets of ports xadapted to register respectively with the openings 52 as indicated, or with the openings 53, according to ,the direction of motion of :the cylinder.

At the opposite end ofthe Apart 49, 50 is Aan end plate ,58 corresponding with the part 48. Each of these is recessed toy receive fand cushion the :sleeve 56 in its end positions- .A somewhat simpler construction 0f the valve mechanism is illustrated in Figs. 11 and 12, for a pump illustrated in Fig. 13 in which pistons 59 carried by a piston rod 60 are reciprocated by lever mechanism hereinafter described. The valve structure consists of a casting 61 which in this case joins not two hollow piston rods but the two cylinder portions 62. The interior of the casing forms a cylindrical seating containing three rows of ports 63, 64, 65 of which the outer rows are joined to a common inlet port 66 which when the pump is to be used tor suction purposes may be provided with a non-return or check valve 67. The central port 64 on the other hand is joined to the outlet 68 on the opposite side of the cylinders. Within this cylindrical seating there reciprocates a tube section 69 through the center of which passes the piston rod 70.

. This piston rod is a fairly close iit but not fast to the tube section. A number of grooves 71 are provided in the portion of the tube section adjacent the piston rod to prevent leakage of fluid along the piston rod. ln the tube section are two sets of ports 72, 73 designed to coperate with the three rings of ports in the cylindrical `seating and themselves opening into opposite parts of the cylinder.

It will be understood that in this case the initial motion of the piston rod carries the tube section 69 with it, so eecting the necessary change in the port connections.

The alternative operating mechanism employed in this case appears in Fig. 13. The cylinders are erected upon a stand and the piston rod is pivoted at its end to a sleeve 74: on a hand lever 75 which is pivoted at 76 to a rod 77 itself pivoted at 78 to the valve casting 61. The folded position of this operating mechanism is indicated in dotted lines.

What I claim is:

1. A pump comprising a cylinder, a piston reciprocable therein, a tubular piston stem having inlet and outlet sections, and an intermediate member uniting said sections and provided with a partition separating the inlet section from the outlet section, said intermediate member having upper and lower ports opening respectively upon opposite sides of said piston, a valve sleeve slidably mounted on said intermediate member for opening and closing said ports alternately, and a check valve adapted to close the inlet section.r

2. A pump comprising a cylinder, a hollou7 piston rod having inlet and outlet portions and an intermediate connecting section, having a separating partition and ports upon either side thereof, a sleeve having a limited sliding movement upon said intermediate section and provided with ports to alternately register with the ports of said intermediate section, and a check valve 'adapted to close the passage of said inlet two subscribing witnesses.

JEAN ZwicKY.

Witnesses LEONARD E. HAYNES, H. W. K. JENNINGS,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

